5/8x21 sds max bit. SDS MAX carbide bits feature the SDS MAX drive system for fast bit changes and efficient power transfer from the hammer to the bit. Bits under 9/16" feature the highest quality carbide and provide 2 cutting edges. The flutes provide a fast, deep means of clearing concrete dust from deep holes speeding up drill rates. Use only in SDS MAX drive hammers. Shank Type: SDS-Max, Length: 21", Overall Diameter: 5/8" No. 48-20-3920: Shank Type: SDS-Max, Length: 13", Overall Diameter: 3/4" No. 48-20-3932: Shank Type: SDS-Max, Length: 21", Overall Diameter: 3/4" No. 48-20-3946: Shank Type: SDS-Max, Length: 21", Overall Diameter: 7/8" No. 48-20-3952: Shank Type: SDS-Max, Length: 13", Overall Diameter: 1" No. 48-20-3954: Shank Type: SDS-Max, Length: 21", Overall Diameter: 1" No. 48-20-3966: Shank Type: SDS-Max, Length: 21", Overall Diameter: 1-1/8" No. 48-20-3972: Shank Type: SDS-Max, Length: 21", Overall Diameter: 1-1/4" No. 48-20-3988: Shank Type: SDS-Max, Length: 21", Overall Diameter: 1-1/2"